JSON Viewer
Parse, validate and explore JSON in a collapsible, color-coded tree view.
JSON Input
Tree View
Your interactive JSON tree appears here.
What Is the JSON Viewer?
The JSON Viewer parses and validates JSON, then displays it as an interactive, color-coded tree you can expand and collapse. Objects and arrays show their size, strings, numbers, booleans and nulls are color-coded, and invalid JSON is reported with a clear error message. It makes large or deeply nested API responses easy to read. Everything is processed locally in your browser.
How It Works
Paste your JSON on the left. If it's valid, an expandable tree appears on the right — click any object or array to collapse or expand it. Use the copy button to grab nicely formatted, indented JSON. Syntax errors are shown immediately so you can fix them.
When to Use It
Use it to inspect API responses, debug configuration files, explore large JSON payloads, or quickly check that a file is valid JSON before using it elsewhere.
Frequently Asked Questions
- Does it validate my JSON?
- Yes. If the JSON can't be parsed, you'll see the exact error message so you can locate and fix the problem.
- Can it handle large files?
- Yes, within your browser's memory. Very large payloads render fully; deeply nested levels start collapsed for readability.
- Is my data uploaded?
- No. Parsing and rendering happen entirely in your browser — your JSON never leaves your device.
Last reviewed: 2026-06-27